Understanding what your light meter is trying to tell you plays a critical role in your ability to create properly exposed images.

Light meters are designed to measure the amount of light available in a scene. In photography, they are used to determine the appropriate aperture and shutter speed values required to properly expose an image. Back in the film days, not many cameras came with a light meter built-in. Photographers had to rely on external handheld light meters to accurately determine the proper exposure. As time went on, camera manufacturers began incorporating light meters into their camera bodies. This made it much easier for photographers to expose their images properly. Fast forward to today, just about every commercially available digital camera has a light meter built-in.
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